[gdal-dev] When does the env var GDAL_DATA get processed?

[Ari Jolma]

brettwiesner kirjoitti:
> Hi,
>
> I have an application that programatically sets the GDAL_DATA 
> environment variable. However,  when I do this I get errors 
> complaining that it can't find GDAL_DATA. When I use an application 
> like process explorer to see the environment of the process I see that 
> I am correctly setting the environment variable to what I want. If I 
> run the application from a batch file that "sets" the env var before 
> running the application then things work.
>
> Because I can see from process explorer that I'm correctly setting the 
> env var for the process, I am left to believe that some dll get's 
> loaded and the GDAL_DATA env var is used before my code gets a chance 
> to set it. Is this possible? When/ where does the value of the env var 
> GDAL_DATA get used?

Does the error message you get specifically mention GDAL_DATA? I.e., 
does it contain "...Try setting the GDAL_DATA environment variable..."? 
I believe that's the only error message which refers to GDAL_DATA and 
it's called from OGRSpatialReference::importFromEPSGA in 
ogr_fromepsg.cpp. That method "Initialize SRS based on EPSG GCS or PCS 
code." (from docs). It shoudn't be called in an initialization of a DLL.

GDAL_DATA is used often when GDAL needs to find files, but if GDAL_DATA 
is not found there's no complaints.

Regards,

Ari

>
> Thanks,
> Brett
>
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-- 
Prof. Ari Jolma
Environmental Management Information Technology
Teknillinen Korkeakoulu / Helsinki University of Technology
tel: +358 9 4511 address: POBox 5300, 02015 TKK, Finland
Email: ari.jolma at tkk.fi URL: http://geoinformatics.tkk.fi